Support

Table Of Contents

clear banner motd

clear boot

clear cam

clear cgmp statistics

clear config

clear cops

clear counters

clear drip statistics

clear gmrp statistics

clear gvrp statistics

clear igmp statistics

clear ip alias

clear ip dns domain

clear ip dns server

clear ip permit

clear ip route

clear kerberos clients mandatory

clear kerberos credentials forward

clear kerberos creds

clear kerberos realm

2

clear banner motd

Use the clear banner motd command to clear the message-of-the-day banner.

clear banner motd

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

You can use either the clear banner motd command or the set banner motd ## command to clear the message-of-the-day banner.

Examples

This example shows how to clear the message-of-the-day banner:

Console> (enable) clear banner motd

MOTD banner cleared

Console> (enable)

Related Commands

set banner motd

clear boot

Use the clear boot command to clear the contents of the BOOT environment variable and the configuration register setting.

clear boot system all [mod]

clear boot system flash device:[filename] [mod]

clear boot auto-config [mod]

Syntax Description

all	Keyword that specifies clearing the whole BOOT environment variable.
mod	(Optional) Module number of the supervisor engine on which to clear the BOOT environment variable.
flash	Keyword that specifies the Flash file system.
device:	Valid devices include bootflash, slot0, and slot1 for Catalyst 5000 family and 2926G series switches and bootflash for the Catalyst 4000 family and 2948G switches.
filename	(Optional) Filename of the system image on the Flash device.
auto-config	Keyword that specifies the auto-config file.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you want to rearrange the booting order, you can use the prepend keyword with the set boot system command or you can clear the entire BOOT environment variable using the clear boot system command and then redefine the list.

In the Catalyst 5000 family switches, this command is supported on the Supervisor Engine III
and III F.

Examples

This example shows how to clear the contents of the Flash device:

Console> (enable) clear boot system all

BOOT variable = 

Console> (enable)

This example shows how to clear the auto-config file:

Console> (enable) clear boot auto-config

CONFIG_FILE variable =

Console> (enable)

Related Commands

show boot

clear cam

Use the clear cam command to delete a specific entry or all entries from the CAM table.

clear cam {mac_addr | dynamic | static | permanent} [vlan_num]

Syntax Description

mac_addr	One or more MAC addresses to clear from the CAM table.
dynamic	Keyword that clears the dynamic CAM entries from the CAM table.
static	Keyword that clears the static CAM entries from the CAM table.
permanent	Keyword that clears the permanent CAM entries from the CAM table.
vlan_num	(Optional) Number of the VLAN associated with the CAM entries.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you enter the clear cam command on a Catalyst 5000 family or 2926G series switch, the EARL CAM table entries are cleared. If you enter the clear cam command on a Catalyst 4000 family switch, 2948G switch, or 2980G switch, the ASE CAM table entries are cleared.

Examples

This example shows how to remove MAC address 00-40-0b-a0-03-fa from the CAM table:

Console> (enable) clear cam 00-40-0b-a0-03-fa

CAM table entry cleared.

Console> (enable)

This example shows how to clear dynamic entries from the CAM table:

Console> (enable) clear cam dynamic

Dynamic CAM entries cleared.

Console> (enable) 

Related Commands

set cam
show cam

clear cgmp statistics

Use the clear cgmp statistics command to clear CGMP statistical information.

clear cgmp statistics

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear CGMP statistical information:

Console> (enable) clear cgmp statistics

CGMP statistics cleared.

Console> (enable) 

Related Commands

show cgmp statistics

clear config

Use the clear config command to clear the system or module configuration information stored in NVRAM.

clear config mod_num

clear config {rmon | all | extendedrmon}

Syntax Description

mod_num	Number of the module.
rmon	Keyword that clears all RMON configurations, including the historyControlTable, the alarmTable, the eventTable, and the ringStation ControlTable.
all	Keyword that specifies all modules and system configuration information, including the IP address.
extendedrmon	Keyword that specifies the extended RMON configuration information for the Network Analysis module.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

When you clear the configuration using the clear config all command, the default switch configuration is restored. The information that is cleared includes manually configured IP addresses and IP addresses learned through DHCP or RARP.

When you clear the configuration on the Catalyst 5000 family and 2926G series switches, the IP address and subnet mask on the sc0 interface are set to 0.0.0.0.

When you clear the configuration on the Catalyst 4000 family, 2948G, and 2980G switches, the IP address and subnet mask on the me1 and sc0 interfaces are set to 0.0.0.0. The me1 interface is brought down and the sc0 interface is brought up.

---

Note Before using the clear config all command, save a backup of the configuration.

---

When using an RSM or RSFC, the clear config command clears the portion of the RSM or RSFC configuration stored on the Catalyst 5000 family switch. The portion of the configuration stored on the RSM or RSFC must be cleared from the RSM or RSFC CLI.

The extendedrmon keyword is not supported by the Catalyst 4000 family switches, 2948G switches, and 2980G switches.

Examples

This example shows how to delete the configuration information in NVRAM on module 2:

Console> (enable) clear config 2

This command will clear module 2 configuration.

Do you want to continue (y/n) [n]? y

..............................

Module 2 configuration cleared.

Console> (enable)

This example shows how to delete the configuration information stored in NVRAM on module 1 (the supervisor engine module):

Console> (enable) clear config 1

This command will clear module 1 configuration.

Do you want to continue (y/n) [n]? y

......

Module 1 configuration cleared.

host%

This example shows how to delete all the configuration information for the Catalyst 5000 family, 4000 family, 2926G series, 2948G, and 2980G switches:

Console> (enable) clear config all

This command will clear all configuration in NVRAM.

This command will cause ifIndex to be reassigned on the next system startup.

Do you want to continue (y/n) [n]? y

Releasing IP address...Done

......

.................

.....................................................

System configuration cleared.

Console> (enable) 

Related Commands

configure
show config

clear cops

Use the clear cops commands to clear Common Open Policy Service (COPS) configurations.

clear cops roles role1 [role2]...

clear cops all-roles

clear cops server all

clear cops server ipaddress

clear cops domain-name

Syntax Description

roles role#	Keyword and variable that specifies the roles to clear.
all-roles	Keyword that clears all roles.
server	Keyword that specifies the COPS server.
all	Keyword that clears all servers.
ipaddress	The IP address or IP alias of the server.
domain-name	Keyword that clears the domain name of the server.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command is supported by the Catalyst 5000 family switches.

You can use the clear cops all-roles command to clear all the roles.

Examples

This example shows how to clear specific roles:

Console> (enable) clear cops roles backbone_port main_port

Roles cleared.

Console> (enable) 

This example shows how to clear all roles:

Console> (enable) clear cops all-roles

All roles cleared.

Console> (enable) 

This example shows how to clear all COPS servers:

Console> (enable) clear cops server all

All COPS servers cleared.

Console> (enable) 

This example shows how to clear a specific COPS server:

Console> (enable) clear cops server my_server1

All COPS servers cleared.

Console> (enable) 

This example shows how to clear the COPS domain name:

Console> (enable) clear cops domain-name

Domain name cleared.

Console> (enable) 

Related Commands

show cops
set cops

clear counters

Use the clear counters command to clear MAC and port counters.

clear counters

Syntax Description

This command has no keywords or arguments.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command also clears ATM module counters.

Examples

This example shows how to reset MAC and port counters to zero:

Console> (enable) clear counters

MAC and Port counters cleared.

Console> (enable)

Related Commands

show port

clear drip statistics

Use the clear drip statistics command to clear DRiP statistical information.

clear drip statistics

Syntax Description

This command has no keywords or arguments.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear DRiP statistical information:

Console> (enable) clear drip statistics

DRIP statistics cleared.

Console> (enable) 

Related Commands

show drip statistics

clear gmrp statistics

Use the clear gmrp statistics command to clear all the GMRP statistics information from a specified VLAN or all VLANs.

clear gmrp statistics {vlan | all}

Syntax Description

vlan	Number of the VLAN.
all	Keyword that specifies all VLANs.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear GMRP statistical information from all VLANs:

Console> (enable) clear gmrp statistics all

GMRP statistics cleared.

Console> (enable) 

This example shows how to clear GMRP statistical information from VLAN 1:

Console> (enable) clear gmrp statistics 1

GMRP statistics cleared from VLAN 1.

Console> (enable) 

Related Commands

show gmrp statistics

clear gvrp statistics

Use the clear gvrp statistics command to clear all the GVRP statistics information.

clear gvrp statistics {mod/port | all}

Syntax Description

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear GVRP statistical information:

Console> (enable) clear gvrp statistics all

GVRP statistics cleared for all ports.

Console> (enable) 

This example shows how to clear GVRP statistical information for module 2, port 1:

Console> (enable) clear gvrp statistics 2/1

GVRP statistics cleared on port 2/1.

Console> (enable) 

Related Commands

show gvrp statistics
set gvrp

clear igmp statistics

Use the clear igmp statistics command to clear IGMP router port statistical information.

clear igmp statistics

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command is supported by the Catalyst 5000 family switches and the Catalyst 2926G series switches.

Examples

This example shows how to clear IGMP statistical information:

Console> (enable) clear igmp statistics

IGMP statistics cleared.

Console> (enable) 

Related Commands

show igmp statistics

clear ip alias

Use the clear ip alias command to clear IP aliases that are set using the set ip alias command.

clear ip alias {name | all}

Syntax Description

name	IP address alias to delete.
all	Keyword that specifies that all previously set IP address aliases be deleted.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to delete a previously defined IP alias named babar:

Console> (enable) clear ip alias babar

IP alias deleted.

Console> (enable)

Related Commands

set ip alias
show ip alias

clear ip dns domain

Use the clear ip dns domain command to clear the default DNS domain name.

clear ip dns domain

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the default DNS domain name:

Console> (enable) clear ip dns domain

Default DNS domain name cleared.

Console> (enable)

Related Commands

set ip dns domain
show ip dns

clear ip dns server

Use the clear ip dns server command to remove a DNS server from the DNS server listing.

clear ip dns server {ip_addr | all}

Syntax Description

ip_addr	IP address of the DNS server you want to remove. An IP alias or a host name that can be resolved through DNS can also be used.
all	Keyword that specifies all the IP addresses in the DNS server listing be removed.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to remove the DNS server at IP address 192.168.255.255 from the DNS server listing:

Console> (enable) clear ip dns server 192.168.255.255

192.168.255.255 cleared from DNS table.

Console> (enable)

Related Commands

set ip dns server
show ip dns

clear ip permit

Use the clear ip permit command to remove a specified IP address and mask or all IP addresses and masks from the permit list.

clear ip permit {ip_addr} [mask] [snmp | telnet | all]

clear ip permit all

Syntax Description

ip_addr	IP address to be cleared. An IP alias or a host name that can be resolved through DNS can also be used.
mask	(Optional) Subnet mask of the specified IP address.
snmp	(Optional) Keyword that specifies removal from the SNMP IP permit list.
telnet	(Optional) Keyword that specifies removal from the Telnet IP permit list.
all	(Optional) Keyword that specifies removal from both SNMP and Telnet IP permit lists.
all	Keyword that specifies all entries in the IP permit list be removed.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

The clear ip permit all command clears the permit list but does not change the state of the IP permit feature. A warning is displayed if all IP addresses are cleared from the permit list, and the feature is enabled. If a mask other than the default (255.255.255.255) has been configured, you must provide both the address and mask to clear a specific entry.

If the snmp, telnet, or all keyword is not specified, the IP address is removed from both the SNMP and Telnet permit lists.

Examples

These examples show how to remove specified IP addresses:

Console> (enable) clear ip permit 172.100.101.102

172.100.101.102 cleared from IP permit list.

Console> (enable)

Console> (enable) clear ip permit 172.160.161.0 255.255.192.0 snmp

172.160.128.0 with mask 255.255.192.0 cleared from snmp permit list.

Console> (enable)

Console> (enable) clear ip permit 172.100.101.102 telnet

172.100.101.102 cleared from telnet permit list.

Console> (enable)

Console> (enable) clear ip permit all

IP permit list cleared.

WARNING

IP permit list is still enabled.

Console> (enable)

Related Commands

set ip permit
show ip permit
show port counters

clear ip route

Use the clear ip route command to delete IP routing table entries.

clear ip route all

clear ip route destination gateway

Syntax Description

all	Keyword that deletes all IP routing table entries.
destination	IP address of the host or network. An IP alias or a host name that can be resolved through DNS can also be used.
gateway	IP address or alias of the gateway router.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to delete the route table entries using the clear ip route command:

Console> (enable) clear ip route 172.16.2.2 elvis

Route deleted.

Console> (enable)

Related Commands

set ip route
show ip route

clear kerberos clients mandatory

Use the clear kerberos clients mandatory command to disable mandatory Kerberos authentication for services on the network.

clear kerberos clients mandatory

Syntax Description

This command has no arguments or keywords.

Defaults

Kerberos clients are NOT set to mandatory.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

A user authenticated to a Kerberized switch has a ticket granting ticket (TGT) and can use it to authenticate to a host on the network. However, if forwarding is not enabled and a user tries to list credentials after authenticating to a host, the output will show no Kerberos credentials present.

You can optionally configure the switch to forward users' TGTs with them as they authenticate from the switch to Kerberized remote hosts on the network when using Kerberized Telnet.

As an added layer of security, you can optionally configure the switch so that after users authenticate to it, they can authenticate to other services on the network only with Kerberos clients. If you do not make Kerberos authentication mandatory and Kerberos authentication fails, the application attempts to authenticate users using the default method of authentication for that network service. For example, Telnet prompts for a password.

Examples

This example shows how to clear mandatory Kerberos authentication:

Console> (enable) clear kerberos clients mandatory 

Kerberos clients mandatory cleared

Console> (enable)

Related Commands

set kerberos clients mandatory
set kerberos credentials forward

clear kerberos credentials forward

Use the clear kerberos credentials forward command to disable credentials forwarding.

clear kerberos credentials forward

Syntax Description

This command has no arguments or keywords.

Defaults

Forwarding is disabled by default.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

A user authenticated to a Kerberized switch has a ticket granting ticket (TGT) and can use it to authenticate to a host on the network. However, if forwarding is not enabled and a user tries to list credentials after authenticating to a host, the output will show no Kerberos credentials present.

You can optionally configure the switch to forward users' TGTs with them as they authenticate from the switch to Kerberized remote hosts on the network when using Kerberized Telnet.

Examples

This example shows how to disable Kerberos credentials forwarding:

Console> (enable) clear kerberos credentials forward 

Kerberos credentials forwarding disabled

Console> (enable) 

Related Commands

set kerberos credentials forward
set kerberos clients mandatory

clear kerberos creds

Use the clear kerberos creds command to delete all the Kerberos credentials.

clear kerberos creds

Syntax Description

This command has no arguments or keywords.

Defaults

Forwarding is disabled by default.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

A user authenticated to a Kerberized switch has a ticket granting ticket (TGT) and can use it to authenticate to a host on the network. This command deletes all Kerberos credentials.

Examples

This example shows how to delete all Kerberos credentials:

Console> (enable) clear kerberos creds

Console> (enable) 

Related Commands

set kerberos credentials forward

clear kerberos realm

Use the clear kerberos realm command to clear an entry that is mapping the name of a Kerberos realm to a DNS domain name or a host name.

clear kerberos realm {dns-domain | host} kerberos-realm

Syntax Description

dns-domain	Keyword that specifies the DNS domain name to map to a Kerberos realm.
host	Keyword that specifies the IP address or name to map to a Kerberos realm.
kerberos-realm	The IP address or name of a Kerberos realm.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

The name of the Kerberos realm can sometimes be mapped to a DNS domain name or a host name. This mapping can be done with the set kerberos realm command.

Examples

This example shows how to clear an entry mapping a kerberos-realm to a domain name:

Console> (enable) clear kerberos realm CISCO CISCO.COM

Kerberos DnsDomain-Realm entry CISCO - CISCO.COM deleted

Console> (enable) 

Related Commands

set kerberos realm
set kerberos local-realm